Bacterial Contamination is easily the most unnerving vocaloid PV. The song's lyrics about being alone and bullied and wanting to contaminate others while slowly dying inside leaves the viewer with nothing but despair, this segregation that is forced upon the main character makes her see herself as this hideous monster made up of doll parts, machinery and insect limbs, while high-school girls with the upper part of their head missing haunt her through-out the song. Everything about this song is crafted in a way to intentionally make whoever's watching discomforted by sight of this this girl having seemingly no way out of her torment, It doesn't tryto convey any semblance of hope because those who are in her situation don't see a shred of it, all they see is themselves becoming a monster harboring ill feelings towards those that haunt them/ This pv is the kind of vocaloid song that needs to exist if that medium wants to be recognized as art eventually. Just as there needs to be super sappy honeyworks love songs and whatever Owata-P songs are, there needs to be songs that express despair without holding any of the unsightliness that comes with it.
